Chapter Three – Troubleshooting Guides
39
3.4 BED MOTION TROUBLESHOOTING GUIDE
NOTE
Before proceeding, ensure the foot board is properly installed and electrical connections are made. Ensure
all bed motion lockouts are functioning properly and are turned off. Prior to replacing any boards, ensure all
applicable cables and connections are intact (visually and mechanically). Check for +5 VDC at various points
called out in the troubleshooting by using digital ground as a reference point (negative side of C18 on CPU
litter board). When measuring 110 VAC at any point, use only the neutral (white) side of the power lines as
a reference point. DO NOT use digital ground as a reference point when measuring 110 VAC.
If bed lift motion is not functioning properly, check Lift Lock Light on the foot board. If one of the lift potentiome-
ters is disconnected, the Lift Lock Light in the foot board will flash constantly.
PROBLEM/SYMPTOM
SOLUTION(S)
Bed will not raise when switch is depressed.
Bed will not lower when switch is depressed.
A. Check switch keyboards in siderails for +5 VDC
at connector J1, pin 1 (see page 200 & 201 for
board locations). Use connector J2, pin 2 of the
inside Gatch/Fowler board (p/n 3000–400–901/
917) as a ref. point. If voltage is present and key-
boards are not O.K., replace siderail keyboards
(p/n 3000–400–929 and 3000–400– 915).
B. Check switch keyboard in foot board for +5
VDC at connector P1, pin 6. If voltage is present
and problem still exists, replace keyboard (p/n
3000–500–943). If problem still exists after replac-
ing the keyboard, check foot board IFC board (p/n
3000–500–955) for +8 VDC at connector P3, pin 5
(use pin 7 as a ref. point) (see page 202 for board
location). If voltage is present and the problem
still exists, check for +5 VDC at connector P2, pin
6 (use connector P3, pin 7 as a ref. point). If volt-
age is present and problem still exists, replace foot
board IFC board.
C. If bed will raise but not lower, check motion in-
terrupt switches (p/n 3000–300–941) and verify
the switches are functioning properly and that for-
eign objects (sheets, blankets, etc.) are not actuat-
ing them. Replace as necessary (see page 96).
D. Check fuse F1 on litter CPU board (p/n 3000–
300–941) (see page 199 for board location). If
fuse is O.K., check for +8 VDC at connector P9,
pin 5. If voltage is not present, check for +5 VDC
at connector P10, pin 10. If +5 VDC is not pres-
ent, replace litter CPU board (see page 115). If
voltages are present and litter CPU board is still
suspect, refer to step H.
E. Check 110 VAC to head and foot lift motors
when switch is pressed. If voltage is not present,
check power junction board (p/n 3000–300–961)
and fuses F1–F2, on the board. Check for 110
VAC at input (J1), pin 2, outputs (J3), pin 2 & (J4),
pin 2 with bed up/bed down switch pressed. If
voltages are present, check motors and mechani-
cal lifts.
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